:root{--ink:#26334a;--line:#30415f;--paper:#fffdf7;--purple:#7656a8;--lavender:#d9c9ef;--mint:#bde5d2;--yellow:#f4d67f;--pink:#efb8b0;--blue:#b9dbea;--good:#2d9b55;--bad:#c74343}
.lesson-group summary{display:grid;grid-template-columns:clamp(90px,14vw,160px) 1fr auto;align-items:center;gap:clamp(12px,2vw,22px);padding:9px 14px 9px 9px;border-radius:12px}.section-visual{display:block;width:100%;height:82px;border:2px solid var(--line);border-radius:8px;background:#fff;object-fit:cover}.section-name{line-height:1.15}@media(max-width:520px){.lesson-group summary{grid-template-columns:82px 1fr auto;gap:9px;padding-right:9px}.section-visual{height:64px}.section-toggle{width:30px;height:30px}}
.lesson-group summary{display:flex;align-items:center;justify-content:space-between;gap:14px;margin:0;padding:12px 16px;border:3px solid var(--line);border-radius:9px;background:var(--yellow);font-size:1.35rem;font-weight:900;cursor:pointer;box-shadow:3px 3px rgba(38,51,74,.2);list-style:none}.lesson-group summary::-webkit-details-marker{display:none}.lesson-group summary:hover{filter:brightness(1.04)}.lesson-group summary:focus-visible{outline:5px solid #2166d1;outline-offset:3px}.section-toggle{display:grid;place-items:center;width:34px;height:34px;border:2px solid var(--line);border-radius:50%;background:#fff;font-size:1.5rem;line-height:1;transition:transform .2s}.lesson-group[open] .section-toggle{transform:rotate(180deg)}.lesson-group>.activity-grid{margin-top:13px}.lesson-group:not([open])>.activity-grid{display:none}
.lesson-visual{margin:0;overflow:hidden;border:3px solid var(--line);border-radius:10px;background:#faf7ef}.lesson-visual img{display:block;width:100%;max-height:min(48vh,480px);object-fit:contain}
.highlight-activity h2{margin-bottom:24px}.sentence-answers{display:flex;flex-wrap:wrap;align-items:baseline;gap:.28em;padding:22px;border:3px solid #b78b45;border-radius:10px;background:#f3e6b9;font-size:clamp(1.5rem,3vw,2.25rem);line-height:1.8}.word-answer{min-height:0;padding:.08em .18em;border:0;border-radius:5px;background:transparent!important;box-shadow:none;font-size:inherit;font-weight:500}.word-answer:hover,.word-answer:focus-visible{background:#fff8d9!important;text-decoration:underline}.word-answer.correct,.word-answer.correct:disabled{background:#77d895!important;color:#183d24;text-decoration:underline;text-decoration-thickness:4px;opacity:1}.word-answer.wrong{background:#f3a0a0!important}.word-answer:disabled{opacity:.62}
*{box-sizing:border-box}body{margin:0;min-height:100vh;background:linear-gradient(135deg,rgba(70,42,112,.82),rgba(31,104,117,.78)),url("../site/letterbck.jpg") center/cover fixed;color:var(--ink);font-family:"Century Gothic","Aptos","Segoe UI",sans-serif}.menu-shell,.app-shell{width:min(1180px,calc(100% - 28px));margin:auto;padding:28px 0}.menu-panel,.activity-panel{min-height:calc(100vh - 56px);padding:clamp(18px,3vw,36px);border:4px solid var(--line);border-radius:14px;background:rgba(255,253,247,.97);box-shadow:12px 12px 0 rgba(20,14,35,.3)}h1{margin:12px 0 4px;color:#563a86;font-size:clamp(3rem,8vw,6.5rem);line-height:1;text-shadow:3px 3px #d8c5ed}.menu-header p{margin:12px 0 0;color:#667085;font-weight:800}.back-link{display:inline-flex;padding:10px 15px;border:3px solid var(--line);border-radius:9px;background:#fff;color:var(--ink);font-weight:900;text-decoration:none;box-shadow:3px 3px rgba(38,51,74,.2)}.lesson-group{margin-top:32px}.lesson-group h2{display:inline-block;margin:0 0 12px;padding:7px 15px;border:3px solid var(--line);border-radius:8px;background:var(--yellow);font-size:1.35rem}.activity-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(245px,1fr));gap:13px}.activity-link{display:grid;grid-template-columns:48px 1fr;align-items:center;gap:12px;min-height:91px;padding:13px;border:3px solid var(--line);border-radius:10px;background:var(--blue);color:var(--ink);text-decoration:none;box-shadow:4px 4px rgba(38,51,74,.22);transition:.15s}.activity-link:nth-child(4n+2){background:var(--yellow)}.activity-link:nth-child(4n+3){background:var(--pink)}.activity-link:nth-child(4n){background:var(--mint)}.activity-link:hover{transform:translate(2px,2px);box-shadow:2px 2px rgba(38,51,74,.25)}.lesson-number{display:grid;place-items:center;width:44px;height:44px;border:3px solid var(--line);border-radius:50%;background:#fff;font-weight:900}.activity-link strong,.activity-link small{display:block}.activity-link strong{font-size:1.05rem}.activity-link small{margin-top:5px;color:#4f5f74;font-weight:700}.activity-header{display:flex;align-items:center;justify-content:space-between;gap:14px}.progress{font-weight:900}.lesson-title{margin:25px 0 16px;color:#563a86;font-size:clamp(2.2rem,6vw,4.8rem);line-height:1.05}.explanation{display:grid;gap:17px;padding:clamp(18px,3vw,30px);border:4px solid var(--line);border-radius:12px;background:#fff}.explanation p{margin:0;font-size:clamp(1.1rem,2vw,1.35rem);font-weight:700;line-height:1.5}.example{padding:16px;border-left:9px solid var(--purple);border-radius:6px;background:#eee7f8;font-size:clamp(1.2rem,2.5vw,1.65rem);font-weight:900}.tip{padding:13px;border:3px solid #a88323;border-radius:8px;background:#fff3bd;font-weight:800}.start-button,.next-button,.answer{border:3px solid var(--line);border-radius:10px;color:var(--ink);font:inherit;font-weight:900;cursor:pointer;box-shadow:4px 4px rgba(38,51,74,.22)}.start-button,.next-button{display:block;margin:24px auto 0;padding:15px 28px;background:var(--mint);font-size:1.25rem}.question-card{margin-top:22px;padding:clamp(18px,3vw,30px);border:4px solid var(--line);border-radius:12px;background:#fff}.question-card h2{margin:0 0 12px;color:#6c4b9b}.question{margin:10px 0 22px;font-size:clamp(1.35rem,3vw,2rem);font-weight:900;line-height:1.35}.answers{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px}.answer{min-height:74px;padding:12px;background:var(--blue);font-size:clamp(1.05rem,2vw,1.35rem)}.answer:nth-child(4n+2){background:var(--yellow)}.answer:nth-child(4n+3){background:var(--pink)}.answer:nth-child(4n){background:var(--mint)}.answer.correct{background:#64dc88}.answer.wrong{background:#f48787}.answer:disabled{cursor:default;opacity:.55}.answer.correct:disabled{opacity:1}.feedback{min-height:32px;margin:18px 0 0;text-align:center;font-size:1.2rem;font-weight:900}.feedback.good{color:var(--good)}.feedback.bad{color:var(--bad)}.complete{text-align:center;padding:36px}.complete-mark{display:grid;place-items:center;width:150px;height:150px;margin:auto;border-radius:50%;background:#58d87f;color:#fff;font:900 7rem/1 Arial;box-shadow:0 9px #29974c}.complete h2{font-size:2.5rem}.complete-links{display:flex;flex-wrap:wrap;justify-content:center;gap:14px}.complete-links a{padding:13px 18px;border:3px solid var(--line);border-radius:9px;background:var(--yellow);color:var(--ink);font-weight:900;text-decoration:none}button:focus-visible,a:focus-visible{outline:5px solid #2166d1;outline-offset:3px}@media(max-width:650px){.menu-shell,.app-shell{width:calc(100% - 14px);padding:7px 0}.menu-panel,.activity-panel{min-height:calc(100vh - 14px);padding:13px}.activity-grid{grid-template-columns:1fr}.answers{grid-template-columns:1fr}.lesson-title{margin-top:20px}}

/* Classroom Smartboard: large targets and a red-pen drawing surface. */
.smartboard-mode .app-shell{width:min(1600px,calc(100% - 24px));padding:12px 0}
.smartboard-mode .activity-panel{min-height:calc(100vh - 24px);padding:clamp(16px,2vw,30px)}
.smartboard-mode .back-link{min-height:58px;font-size:1.15rem}
.smartboard-mode .progress{font-size:1.3rem}
.smartboard-mode .lesson-title{margin:14px 0 10px;font-size:clamp(2.4rem,4.5vw,4.8rem)}
.smartboard-mode .question-card{margin-top:10px;padding:clamp(18px,2vw,28px)}
.smartboard-mode .question-card h2{font-size:clamp(1.7rem,2.6vw,2.7rem)}
.smartboard-mode .answer{min-height:96px;padding:18px;font-size:clamp(1.35rem,2.2vw,2rem);touch-action:manipulation}
.smartboard-mode .sentence-answers{gap:.42em;padding:28px;font-size:clamp(2rem,3.5vw,3.25rem)}
.smartboard-mode .word-answer{min-height:68px;padding:.12em .24em}
.smartboard-mode .start-button,.smartboard-mode .next-button,.smartboard-mode .check-button{min-height:70px;padding:18px 34px;font-size:1.45rem;touch-action:manipulation}
.smartboard-mode .board-hint{margin:0 0 12px;color:#7a5438;font-size:1.15rem;font-weight:800}
.smartboard-mode .ink-board{position:relative;min-height:clamp(330px,48vh,570px);overflow:hidden;border:4px solid #755235;border-radius:16px;background:#fffef9;box-shadow:inset 0 0 0 8px #f4e7c8;touch-action:none;user-select:none}
.smartboard-mode .ink-prompt{position:relative;z-index:1;padding:clamp(52px,7vh,88px) clamp(34px,5vw,76px);color:#2f251e;font-size:clamp(2.2rem,4vw,4rem);font-weight:750;line-height:1.9;direction:ltr;text-align:left;pointer-events:none}
.smartboard-mode .circle-board .ink-prompt{word-spacing:.22em}
.smartboard-mode .correction-board .ink-prompt{font-family:"Segoe Print","Comic Sans MS",sans-serif;line-height:2.1}
.smartboard-mode .writing-board .ink-prompt{padding-bottom:25px;font-size:clamp(2.6rem,5vw,4.8rem);text-align:center}
.smartboard-mode .writing-line{position:absolute;z-index:1;left:10%;right:10%;top:64%;height:3px;background:#9d8669;box-shadow:0 72px #d5c4a7;pointer-events:none}
.smartboard-mode .ink-canvas{position:absolute;z-index:2;inset:0;width:100%;height:100%;cursor:crosshair;touch-action:none}
.smartboard-mode .ink-controls{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:14px}
.smartboard-mode .ink-clear{min-height:68px;padding:14px 28px;border:3px solid #755235;border-radius:10px;background:#fff9e9;color:#3c291b;font:900 1.3rem/1 inherit;box-shadow:4px 4px rgba(93,63,30,.2);cursor:pointer;touch-action:manipulation}
.smartboard-mode .ink-done{margin:0}
.smartboard-mode .feedback{font-size:1.45rem}
.smartboard-mode .slide-button{width:82px;min-height:76px;font-size:2rem;touch-action:manipulation}
.smartboard-mode .slide-dot{width:24px;height:24px}

.worksheet-downloads{margin:32px auto 0;padding-top:22px;border-top:1px solid currentColor;max-width:720px}.worksheet-downloads h3{margin:0 0 16px;font-size:1.25rem}.worksheet-downloads a{min-height:48px;display:flex;align-items:center;justify-content:center}